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How does blood is circulated in amphibians?

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How does blood is circulated in amphibians?

Postby kumar985 » Fri Jul 20, 2012 4:29 pm

In amphibians like frog,during blood circulation 2 atria contract and pump blood into single ventricle(heart is 3 chamberd).In the ventricle mixed blood is formed.How does mixed blood is circulated to various body parts via aorta?
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Postby suzidoc8 » Sat Jul 21, 2012 4:03 pm

as they need lot of energy to do their activity and they are circulated normal!
no mistakes are allow in medical life.
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Postby JackBean » Mon Jul 23, 2012 1:08 pm

Kumar: what's the problem? What don't you understand? It goes into aorta, which splits and goes both into body and into lungs.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby suzidoc8 » Mon Jul 23, 2012 2:00 pm

The frog circulatory system consist of two atria and one single ventricle. It is the only organ within the coelom which has its own protective covering. The single ventricle is not divided into two compartments like a humans heart, but it is separated enough for the blood not to get mixed. This is done by the arrangement of the frogs heart, where the right atrium dips downward into the ventricle. Which causes oxygen-poor blood that is entering the right atrium to pass all the way down to the bottom of the ventricle. At the same time, oxygen-laden blood is received by the left atrium and enters the same single ventricle. The pool of oxygen-poor blood at the bottom of the ventricle holds up the oxygen -laden blood and prevents it from sinking to the bottom. Then the oxygen-poor blood flows from the ventricle into the vessels leading to the lungs and the oxygen-laden blood is forced into the arteries.
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Postby Darby » Tue Jul 24, 2012 2:43 pm

"Sinking" only applies if frogs were upright bipeds. There may be a slight prevention of mixing, due to the offset entrances, but it's not that critical.

Also, most frogs don't get oxygen just from their lungs...
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